﻿<p>This example illustrates a standard case slab with extruded solid geometry, based on a material layer set usage definition. It includes one round opening and one rectangular recess. Figure 520 shows the resulting shape.</p>
<blockquote class="note">NOTE&nbsp; The opening and recess are instances of <em>IfcOpeningStandardcase</em>.</blockquote>

<table summary="extrusion representation">
 <tr>
  <td><img src="../../figures/examples/slab_with_openings.png" alt="slab_with_openings"/>
  </td>
 </tr>
 <tr style="height:20px;">
  <td style="vertical-align:bottom;">
   <p class="figure">Figure 520 &mdash; Standard case slab with opening and recess.</p>
  </td>
 </tr>
</table>
<blockquote class="note">
NOTE&nbsp; There is no color information within the file, the displayed color has been set by the target application as a default.
</blockquote>